A simulation device for filling of a combustion chamber

Abstract

The utility model discloses a kind of simulation devices of filling in combustion empty area, belong to coal underground gasification mining technical field, including box, the box is enclosed into sealed space by multiple panels, filler is built-in in the sealed space, the filler has formed the combustion empty area of expected form;Multiple connecting ports are respectively arranged on the upper panel and side panel of the box, when connecting port is not used, connecting port is provided with sealing plate and is sealed;Wherein, injection pipe and gas outlet pipe are respectively arranged in at least two connecting ports, the combustion empty area is communicated with outside through injection pipe and gas outlet pipe, and filling material can be injected into the combustion empty area through the injection pipe and gas outlet pipe, and exhaust gas is discharged.The utility model can realize the controllable, visible and quantitative recurrence of complex underground gasification combustion empty area and its filling process, so the migration law and accumulation form of filling material can be systematically studied, and foundation is laid for optimizing filling process, predicting and controlling surface subsidence.

Description

Technical Field

[0001] This utility model belongs to the field of underground coal gasification mining technology, and in particular relates to a simulation device for filling the combustion zone. Background Technology

[0002] Underground coal gasification is a chemical mining technology that converts coal into combustible gas through controlled underground combustion. This technology integrates well construction, mining, and gasification processes. It can not only recover abandoned coal resources from mines but also be used to mine thin coal seams, deep coal seams, coal seams under pressure ("three-level" pressure), and high-sulfur, high-ash, and high-gas coal seams that are difficult or economically unfeasible to mine underground. The gas produced by underground gasification can be used directly for domestic consumption and power generation, and can also be used to extract pure hydrogen or as feedstock for synthetic oils, dimethyl ether, ammonia, and methanol. Therefore, underground coal gasification technology has good economic and environmental benefits, greatly improving the utilization rate and level of coal resources, and is an important research and development direction for clean coal technology in my country.

[0003] Under complex geological conditions, the gasified goaf formed by underground coal seam combustion can lead to roof collapse and other environmental hazards such as ground subsidence. Filling the goaf is a good solution. This can be done by grouting after gasification or by simultaneously supplying dry materials such as pulverized coal, sand, and fly ash to the goaf. However, systematic research and public reports on the actual accumulation morphology, migration patterns, key influencing factors, and control methods of filling materials (whether slurry or dry) after entering the goaf are still relatively scarce. Further in-depth research is urgently needed to support the safe and large-scale application of this technology. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a simulation device for filling gasification gas zones, which can realize the controllable, visual and quantitative reproduction of complex underground gasification gas zones and their filling process. This enables the systematic study of the transport laws and accumulation morphology of filling materials, laying the foundation for optimizing filling processes and predicting and controlling surface subsidence.

[0005] This utility model is implemented as follows: a simulation device for filling a combustion zone includes a box, the box being a sealed space enclosed by multiple panels, and a filler material is placed inside the sealed space, within which a combustion zone of the desired shape has been formed.

[0006] The top panel and side panels of the enclosure are provided with multiple connection ports. When the connection ports are not in use, a sealing plate is provided on the connection ports for sealing.

[0007] At least two of the connection ports are respectively provided with an injection pipe and an exhaust pipe. The combustion air zone is connected to the outside through the injection pipe and the exhaust pipe. Filling material can be injected into the combustion air zone and gas can be discharged through the injection pipe and the exhaust pipe.

[0008] Furthermore, an auxiliary pipe is provided on the outer wall of the injection tube, and the auxiliary pipe is arranged along the axis of the injection tube.

[0009] Furthermore, the outlet end of the injection pipe is provided with a flow-disrupting pipe section, and a flow-disrupting component is provided inside the flow-disrupting pipe section.

[0010] Furthermore, the outlet end of the auxiliary tube is 10mm to 100mm longer than the outlet end of the injection tube.

[0011] Furthermore, the turbulence-disrupting component is a swirling distribution plate, a direct-flow distribution plate, or a diverting flow distribution plate.

[0012] Furthermore, the upper panel of the box is movable between a closed position that closes the top of the box and an open position that opens the top of the box.

[0013] Furthermore, at least one side panel of the enclosure is movable between a closed position that closes the side of the enclosure and an open position that opens the side of the enclosure.

[0014] Furthermore, the filling material can be made of large solid coal simulating underground gasification, concrete pouring, clay sculpture, or brick and mud masonry, and the gap between the filling material and the inner wall of the box can be filled with loess.

[0015] Furthermore, at least one panel of the enclosure is a transparent panel, and the four sides of the transparent panel are fixed to the other panels by a metal frame.

[0016] Furthermore, the remaining connection ports are respectively provided with a temperature measuring element for monitoring the temperature of the combustion zone, a pressure measuring element for monitoring the pressure of the combustion zone, and a flow velocity measuring element for monitoring the fluid flow velocity in the combustion zone.

[0017] The advantages and technical effects of this utility model are as follows: By adopting the above technical solution, the complex underground gasification combustion zone and its filling process can be controlled, visualized and quantitatively reproduced, thereby enabling the systematic study of the transport law and accumulation morphology of the filling material, laying the foundation for optimizing the filling process and predicting and controlling surface subsidence.

[0018] A combustion zone of the desired shape was constructed in a sealed box filled with a filling medium, which simplified the complex and invisible geological conditions underground and eliminated the interference of many uncontrollable variables in the real strata, so as to study the migration and accumulation law of the filling material in the combustion zone. Multiple connection ports are pre-set on multiple panels of the box, which not only provide installation positions for injection pipes and exhaust pipes, but also leave ample space for future experimental expansion. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure provided by this utility model.

[0020] Figure 2 This is a schematic diagram of the installation of the auxiliary pipe provided by this utility model.

[0021] Figure 3 This is a schematic diagram of the swirl distribution plate structure provided by this utility model.

[0022] Figure 4 This is a schematic diagram of the direct-fire distribution plate structure provided by this utility model.

[0023] Figure 5 This is a schematic diagram of the flow distribution plate structure provided by this utility model.

[0024] Figure 6 This is a schematic diagram of an embodiment of the present invention.

[0025] Figure 7 This is a schematic diagram of another embodiment of the present invention.

[0026] In the diagram: 1. Housing; 1-1. Combustion Zone; 1-2. Connection Port; 1-3. Top Panel; 1-4. Side Panel; 2. Injection Pipe; 2-1. Turbulence Pipe Section; 2-2. Swirl Distribution Plate; 2-3. Direct Injection Distribution Plate; 2-4. Diverting Flow Distribution Plate; 3. Exhaust Pipe; 4. Auxiliary Pipe. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0028] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] like Figure 1 As shown, this application provides a simulation device for filling the combustion zone 1-1, including a box 1. The box 1 is a sealed space enclosed by multiple panels. A filler is placed inside the sealed space, and the combustion zone 1-1 of the desired shape is formed within the filler. Specifically, the filler can be made of large solid coal blocks simulating underground gasification, poured concrete, sculpted clay, or constructed of brick and mud. The gap between the filler and the inner wall of the box 1 can be filled with loess to prevent the combustion zone 1-1 from collapsing or leaking gas.

[0030] The top panel 1-3 and side panel 1-4 of the housing 1 are respectively provided with multiple connection ports 1-2, which can be connected to devices such as injection pipe 2, air outlet pipe 3, temperature measuring element, pressure measuring element, and flow rate measuring element. When the connection port 1-2 is not in use, a sealing plate is provided on the connection port 1-2 for sealing.

[0031] At least two connection ports 1-2 are respectively equipped with an injection pipe 2 and an exhaust pipe 3. The combustion air zone 1-1 is connected to the outside through the injection pipe 2 and the exhaust pipe 3. Filling material can be injected into the combustion air zone 1-1 through the injection pipe 2 and the exhaust pipe 3, and gas can be discharged. This is used to study the movement, settling, accumulation, and spreading of the filling material in the combustion air zone 1-1.

[0032] Furthermore, the remaining connection ports 1-2 are respectively equipped with a temperature measuring element for monitoring the temperature of the combustion zone 1-1, a pressure measuring element for monitoring the pressure of the combustion zone 1-1, and a flow velocity measuring element for monitoring the fluid flow velocity within the combustion zone 1-1. Specifically, the temperature measuring element is a thermocouple, the pressure measuring element is a pressure gauge, and both are connected to the combustion zone 1-1 via pipes and connectors. The flow velocity measuring element is a flow meter, and both are connected to the combustion zone 1-1 via pipes and connectors.

[0033] During the filling process in the combustion zone 1-1, the powdered packing material and the gasifying agent are transported in a close phase within the pipeline, which can cause severe pipeline erosion, material adhesion, and blockage. This is particularly pronounced when the gasifying agent has high moisture content. Moist gasifying agent will prematurely contact the powdered packing material inside the pipeline, causing the packing material to become damp and increase in viscosity. This wet material easily adheres to the inner wall of injection pipe 2, gradually accumulating and ultimately reducing the pipeline's flow area or even causing complete blockage.

[0034] In response to the above issues, further, such as Figure 2As shown, an auxiliary pipe 4 is provided on the outer wall of the injection pipe 2, and the auxiliary pipe 4 is arranged along the axis of the injection pipe 2. Specifically, a clamp is provided on the outer wall of the injection pipe 2, and the auxiliary pipe 4 is set on the outer wall of the injection pipe 2 by the clamp. In this way, the powder filling material can be densely transported into the combustion air zone 1-1 and mixed with the gasifying agent in the injection pipe 2, which can avoid the filling material from abrading the wall of the injection pipe 2 or adhering to the inner wall of the injection pipe 2, especially when the moisture content of the gasifying agent is high.

[0035] Without the auxiliary pipe 4, the gasifying agent and the powdered filling material can be mixed and injected into the combustion air zone 1-1 through the injection pipe 2 in a dilute phase transport manner to simulate the movement of the filling material in the combustion air zone 1-1 during gasification and filling; or the fluidized filling material can be directly injected into the combustion air zone 1-1 from the injection pipe 2 to simulate the movement and / or final accumulation of the filling material in the combustion air zone 1-1 during gasification and filling of the combustion air zone 1-1.

[0036] Preferably, the outlet end of the auxiliary tube 4 is 10mm to 100mm longer than the outlet end of the injection tube 2.

[0037] like Figures 3 to 5 As shown, furthermore, a turbulence-inducing pipe section 2-1 is provided at the outlet end of the injection pipe 2, and the turbulence-inducing pipe section 2-1 is connected to the outlet end of the injection pipe 2 by thread. A turbulence-inducing component is provided within the turbulence-inducing pipe section 2-1. Specifically, the turbulence-inducing component is a swirl distribution plate 2-2, a direct injection distribution plate 2-3, or a branching flow distribution plate 2-4. The active intervention of the turbulence-inducing pipe section 2-1 facilitates the study of the movement morphology of the filling material in the combustion air zone 1-1. The swirl distribution plate 2-2 includes multiple fan blades arranged in a ring around the center; the direct injection distribution plate 2-3 includes a large-diameter end and a small-diameter end, with the small-diameter end facing the outlet of the auxiliary pipe 4; the branching flow distribution plate 2-4 is provided with multiple guide ports, through which the flow disperses in different directions.

[0038] The swirl distribution plate 2-2 and the diverting flow distribution plate 2-4 are suitable for studying whether the gasifying agent can blow up the residual coal ash from coal gasification and / or the movement and / or final accumulation of the packing material carried by the gasifying agent in the combustion air zone 1-1. The direct injection distribution plate 2-3 is suitable for cases where the outer wall of the injection pipe 2 has a coaxial auxiliary pipe 4. The small end of the direct injection distribution plate 2-3 pipe section faces the outlet of the auxiliary pipe 4. It is used to study the movement and / or final accumulation of the packing material in the combustion air zone 1-1 when the gasifying agent and the packing material are mixed in the underground combustion air zone 1-1, the gasifying agent flows in the direction of the direct injection packing material's fall, and the turbulence of the packing material is enhanced.

[0039] Furthermore, the upper panel 1-3 of the housing 1 is movable between a closed position where the top of the housing 1 is closed and an open position where the top of the housing 1 is open. Specifically, the upper panel 1-3 can be hinged to an adjacent side panel via a pivot, thereby enabling the opening and closing of the upper panel 1-3. In use, the upper panel 1-3 can be fixed and sealed with bolts.

[0040] And / or at least one side panel 1-4 of the housing 1 is movable between a closed position that closes the side of the housing 1 and an open position that opens the side of the housing 1. Specifically, the side panel 1-4 can be hinged to an adjacent base plate via a pivot to realize the opening and closing of the side panel 1-4, and can be fixed and sealed with bolts during use.

[0041] The top panel 1-3 and / or side panel 1-4 of the housing 1 can be opened to facilitate access to the interior cavity of the housing 1 to arrange the combustion zone 1-1 of the desired shape, which is convenient for equipment debugging and subsequent cleaning.

[0042] Furthermore, at least one panel of the housing 1 is a transparent panel, which can be made of quartz glass, tempered glass, acrylic, or other materials. The four sides of the transparent panel are fixed to the other panels by a metal frame. This allows for realistic observation of the movement of the filling material. Based on the temperature resistance characteristics of quartz glass, tempered glass, and acrylic, these three materials are typically suitable for simulating combustion zone 1-1 filling at temperatures not exceeding 1200℃, 400℃, and 70℃, respectively.

[0043] In one embodiment, such as Figure 6 As shown, a half-pear-shaped cavity (simulating the combustion zone) is filled with concrete and placed inside the box 1. Sleeves are connected to the bottom of both ends of the cavity. The injection pipe 2 and the exhaust pipe 3 enter the sleeve through the connection port 1-2 on the box 1 and extend into the combustion zone 1-1. The remaining space inside the box 1 is filled and sealed with loess.

[0044] Position the end of injection pipe 2 within the combustion zone 1-1 at a distance A, one-third of the length of the combustion zone 1-1 from the projection point of outlet pipe 3 at the bottom of combustion zone 1-1. Seal the connection between outlet pipe 3, injection pipe 2, and housing 1. Open outlet pipe 3 and inject a gasifying agent carrying a certain proportion of filling material into combustion zone 1-1 through injection pipe 2 at a certain flow rate. After a period of time, stop injecting the gasifying agent.

[0045] Remove injection pipe 2, connect the built-in turbulence-distributing pipe section to the end of injection pipe 2, and install swirl distribution plate 2-2 inside the turbulence-distributing pipe section. Extend injection pipe 2 into combustion air zone 1-1 again, and place the end of the built-in distribution plate pipe section at position B, which is two-thirds of the length of combustion air zone 1-1, from the bottom projection point of gas outlet pipe 3 in combustion air zone 1-1. Inject gasifying agent carrying the same proportion of filling material into combustion air zone 1-1 through injection pipe 2 at the same flow rate as before. After the same time, stop injecting gasifying agent.

[0046] Open box 1, remove the compacted loess, uncover the concrete filler, and observe the accumulation pattern of the two filling materials as follows: Figure 6 As shown, the first filling material was stacked in a cone shape, while the second filling material was distributed in a flatter shape, resembling a turbot lying close to the ground. The spreading dimensions were measured and analyzed.

[0047] In another embodiment, such as Figure 7 As shown, a filling material containing a half-flat bell-shaped cavity is sculpted from clay to simulate the combustion zone 1-1 formed by the upward gasification of vertical holes in an ultra-thick coal seam. One side of the bell face is cut off and closely attached to the front panel 1-4 of the box body 1. The front panel 1-4 is made of transparent acrylic material. Two gas outlet pipes 3 sandwich an injection pipe 2 that enters the combustion zone 1-1 from the top of the bell in parallel downwards. The gap between the filling material and the side wall of the box body 1 is filled with loess to seal the connection between the injection pipe 2, the gas outlet pipe 3 and the box body 1.

[0048] Open the exhaust pipe 3 and inject filling material into the combustion zone 1-1 through the injection pipe 2. Through the transparent panel, it can be seen that the filling material first accumulates into a small cone at the projection point of the injection pipe 2 at the bottom of the combustion zone 1-1. As the filling material increases, the spreading radius at the bottom of the cone gradually expands. When it encounters the obstruction of the front panel 1-4 and the rear wall of the combustion zone 1-1, it stops expanding and then accelerates its spread to the left and right sides. When it reaches the edge of the combustion zone 1-1, the edge of the filling material accumulation begins to rise parallel to the generatrix of the cone. The accumulation pattern of the filling material is as follows: Figure 7 As shown, the angle between the generatrix of the cone and the horizontal plane is close to the angle of repose of the filling material.

[0049] By adopting the above technical solution, the complex underground gasification combustion zone 1-1 and its filling process can be controlled, visualized and quantitatively reproduced, thereby enabling a systematic study of the transport law and accumulation morphology of the filling material, laying the foundation for optimizing the filling process and predicting and controlling surface subsidence.

[0050] A combustion zone 1-1 of the desired shape was constructed inside a sealed box 1 that can be filled with a medium. This cleverly simplifies the complex and invisible geological conditions underground, eliminates the interference of many uncontrollable variables in the real strata, and studies the migration and accumulation law of the filling material in the combustion zone. Multiple connection ports 1-2 are pre-set on multiple panels of the box 1, which not only provide installation positions for the injection pipe 2 and the exhaust pipe 3, but also leave sufficient space for future experimental expansion.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A simulation device for filling the combustion zone, characterized in that, Includes a housing, which is a sealed space enclosed by multiple panels, and a filler is placed inside the sealed space, within which a combustion zone of the desired shape has been formed; The top panel and side panels of the enclosure are provided with multiple connection ports. When the connection ports are not in use, a sealing plate is provided on the connection ports for sealing. At least two of the connection ports are respectively provided with an injection pipe and an exhaust pipe. The combustion air zone is connected to the outside through the injection pipe and the exhaust pipe. Filling material can be injected into the combustion air zone and gas can be discharged through the injection pipe and the exhaust pipe.

2. The simulation device for filling the combustion zone according to claim 1, characterized in that, An auxiliary pipe is provided on the outer wall of the injection tube, and the auxiliary pipe is arranged along the axis of the injection tube.

3. The simulation device for filling the combustion zone according to claim 1 or 2, characterized in that, The outlet end of the injection pipe is provided with a flow-dispersing pipe section, and the flow-dispersing pipe section is provided with flow-dispersing components.

4. The simulation device for filling the combustion zone according to claim 2, characterized in that, The outlet end of the auxiliary tube is 10mm to 100mm longer than the outlet end of the injection tube.

5. The simulation device for filling the combustion zone according to claim 3, characterized in that, The turbulence-disrupting component is a swirling distribution plate, a direct-flow distribution plate, or a diverting flow distribution plate.

6. The simulation device for filling the combustion zone according to claim 1, characterized in that, The top panel of the box can move between a closed position where the top of the box is closed and an open position where the top of the box is open.

7. The simulation device for filling the combustion zone according to claim 1 or 6, characterized in that, At least one side panel of the enclosure is movable between a closed position that closes the side of the enclosure and an open position that opens the side of the enclosure.

8. The simulation device for filling the combustion zone according to claim 1, characterized in that, The filling material can be made of large solid coal to simulate underground gasification, or by concrete pouring, clay sculpture, or brick and mud masonry. The gap between the filling material and the inner wall of the box can be filled with loess.

9. The simulation device for filling the combustion zone according to claim 1, characterized in that, The enclosure has at least one transparent panel, and the four sides of the transparent panel are fixed to the other panels by a metal frame.

10. The simulation device for filling the combustion zone according to claim 1, characterized in that, The remaining connection ports are respectively equipped with a temperature measuring element for monitoring the temperature of the combustion zone, a pressure measuring element for monitoring the pressure of the combustion zone, and a flow velocity measuring element for monitoring the fluid flow velocity in the combustion zone.

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